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Perl Language Reference Manual
by Larry Wall and others
Paperback (6"x9"), 724 pages
ISBN 9781906966027
RRP £29.95 ($39.95)

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%s argument is not a subroutine name

(F) The argument to exists() for exists &sub must be a subroutine name, and not a subroutine call. exists &sub() will generate this error.

ISBN 9781906966027Perl Language Reference ManualSee the print edition